package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.entity.Employee;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws Throwable {
      //获得方法上的数据库类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.value();//数据库操作类型
      //获得拦截参数
        Object[] args = joinPoint.getArgs();
        if (args==null || args.length==0) {
            return;
        }
        Object entity = args[0];
      //准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
      //根据不同情况赋值
      if(operationType == OperationType.INSERT) {
          Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
          Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
          Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
          Method setUpdateUser = entity.getClass().getDeclaredMethod( AutoFillConstant.SET_UPDATE_USER, Long.class);
          //通过反射赋值
          setCreateTime.invoke(entity,now);
          setCreateUser.invoke(entity,currentId);
          setUpdateTime.invoke(entity,now);
          setUpdateUser.invoke(entity,currentId);
      }  else if (operationType == OperationType.UPDATE) {
          Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
          Method setUpdateUser = entity.getClass().getDeclaredMethod( AutoFillConstant.SET_UPDATE_USER, Long.class);

          setUpdateTime.invoke(entity,now);
          setUpdateUser.invoke(entity,currentId);
      }
    }
}
